There is no default gateway defined. Practically there must be one as internet connection works properly (it is also set in Android WiFi settings). Other users seem to have the same routing table behavior (like here). It seems that this behavior started with Android5 as i can see standard "linux style" routing tables (with default gateway) on previous Android versions (like KitKat) on several places on the net.

Anyone know how to query/set/change the default gateway on CM12/Android 5 via shell/bash (not just adding another route with 'route add' - it's more about the specific one that is already set)?